1

Meeting forER-NR Synchronization

on 11th August 2006

POWERGRID, NEW DELHI

2

ER-NR inter-connection through TALA transmission system

MUZAFFARPUR

GORAKHPUR

GORAKHPUR UPMOTIRAM ADDA

TOMANDAULA

LUCKNOW

BAREILLY

UNNAO

PURNEA

BINAGURI

Tala(6X170=1020 MW)

63+ 63

63

63

63

63

63

63

63

63

6350

50

50

50

144 k

m

139 k

m

160 km

242 km

261 km

246 km

70 k

m

NR ER

BHUTAN

INDIA

46

km

2X315 MVAXFMR

1X315 MVAXFMR

2X315 MVAXFMR

1X315 MVAXFMR

2X315 MVAXFMR

2X315 MVAXFMR 250

km

2X315 MVAXFMR

50

50

5050

50

To AgraTo Panki

TO BIHARSHARIF

63168 km T

OB

ON

GA

IGA

ON

TOMALDA

18

km

NR map

ER map

3

S

No.

From end

(400 kV)

To end

(400 kV)

Conductor km From end

Line

Reactor

To end

Line

Reactor

Series

compensation

1 Tala Binaguri D/C Twin Moose 144 0 0 No

2 Tala Binaguri D/C Twin Moose 139 0 0 No

3 Binaguri Purnea D/C Quad Moose 160 0 0 No

4 Purnea Muzaffarpur D/C Quad Moose 242 63 63 40 % fixed + 5 to 15 % variable

At Purnea

5 Muzaffarpur Gorakhpur D/C Quad Moose 260 63 0 40 % fixed + 5 to 15 % variable

at Gorakhpur

6 Gorakhpur Lucknow D/C Twin Moose 245 50 0 No

7 Lucknow Unnao D/C Twin Moose 74 0 0 No

8 Bareli Mandola D/C Twin Moose 237 50 0 No

9 Gorakhpur Gorakhpur D/C Twin Moose 46 0 0 No

Transmission Lines

4

Preparedness for synchronization

Northern Region

5

Anchoring at Lucknow (PGCIL)

LUCKNOW(POWERGRID)

1X315 MVA400/220 kV XFMR

SITAPUR

TO UNNAO(UP)

TO GORAKHPUR(POWERGRID)

CHINHAT

SHAHJANPUR

BAREILLY

TO UNNAO(UP)

TOMANDAULA

HARDOI ROAD

LUCKNOW(UP)

TO SINGRAULI

TO MORADABAD

TO SULTANPUR

TO 220 kV BAREILLI

TO UNNA0

2X240 MVA400/220 kV

XFMR

2X315 MVA400/220 kV

XFMR

TO UNCHHAR

TO UNNAO(UP)

TalaSystem

6

Anchoring at Gorakhpur (PGCIL)

GORAKHPUR(POWERGRID)

50 MVAR

50 MVAR

50 MVAR

2*315 MVA400/220 kV XFMR

BASTI (UP)

TO LUCKNOW(POWERGRID)

TO MUZAFFARPUR(POWERGRID)

GORAKHPUR 220 kV (UP)

GORAKHPUR(UP)

TANDA (UP)

TO AZAMGARH

TO DEORIA

TO SULTANPUR

TalaSystem

7

Elements to be made available in NR

• Contingency arrangement of 400 kV Kanpur Auraiya

• LILO of 220 kV Mainpuri-Harduaganj-I at Mainpuri(PG)

• LILO of 220 kV Mainpuri-Firozabad at Mainpuri (PG)

• 2 x 240 MVA, 400/220 kV ICTs at Obra

• 220 kV Gorakhpur(UP 400 kV)-220 kV Gorakhpur(old)-I

• Closing of loops in U.P. system

NR LineDiagram

NR Power Map

UPPower Map

8

400 kV Kanpur-Agra ckt 2 by utilizing Kanpur-Auraiya

400 kV Auraiya

400 kV Kanpur

Panki400 kV Agra

To Obra

To Unnao

To Muradnagar

To Ballabgarh

To Ballabgarh

To Bassi

166 km

67 km

6 km

To Allahabad

New element

9

Preparedness for synchronization

Eastern Region

10

Anchoring at Muzaffarpur (PGCIL)

MUZAFFARPUR(POWERGRID)

63 MVAR

63 MVAR

63 MVAR

63 MVAR

1x315 MVA400/220 kV XFMR

FATUHA

MUZAFFARPURKanti-(BSEB)

TO PURNEA(POWERGRID)

TO GORAKHPUR(POWERGRID)

BIHARSHARIF(BSEB)

3*315 MVA400/220 kV XFMR

63 MVAR

TOTENUGHAT

TO BODHGAYA

Radial Load

TalaSystem

ER map

Bihar

Jharkhand

11

Radial load on Muzaffarpur

Eastern Region

12

PurneaBSEB

NepalKept Normally open

MTPS

MotihariBetiah

Ekma

ChapraSiwan

Gopalgunj

Hazipur

Muzaffarpur 220kV

Samastipur

Barauni

Biharsariff

220 kV lineCharged at 132kv

Ramnagar

Nepal

Hatidah

Not connected

2x100MVA Darbhanga

Pandaul

Sitamari

Muzf Town

Radialised Load

( 150 MW)

Madhubani

North Bihar System- prior to radialisation at Muzaffarpur

MB TB

13

PurneaBSEB

NepalKept Normally open

MTPS

MotihariBetiah

Ekma

ChapraSiwan

Gopalgunj

Hazipur

Muzaffarpur 220kV

Samastipur

Barauni

Biharsariff

Ramnagar

Nepal

Hatidah

Not connected

2x100MVA Darbhanga

Pandaul

Sitamari

Muzf Town

Radialised Load

(70-80 MW)

Madhubani

MB TB

Radialisation on Muzaffarpur8th Aug 2006, 12:12 Hrs

220 kV lineCharged at 132kv

14

PurneaBSEB

NepalKept Normally open

MTPS

MotihariBetiah

Ekma

ChapraSiwan

Gopalgunj

Hazipur

Muzaffarpur 220kV

Samastipur

Barauni

Biharsariff

Ramnagar

Nepal

Hatidah

Not connected

2x100MVA Darbhanga

Pandaul

Sitamari

Muzf Town

Radialised Load

( 150 MW)

Madhubani

Extension of Radial Load – 9th Aug’2006

100MVA

220 kV lineCharged at 132kv

15

SUGGESTED RADIAL OPERATION WITH

1 X100MVA ICT AT MTPS -KANTI

16

PurneaBSEB

NepalKept Normally open

MTPS

MotihariBetiah

Ekma

ChapraSiwan

Gopalgunj

Hazipur

Muzaffarpur 220kV

Samastipur

Barauni

Biharsariff

Ramnagar

Nepal

Hatidah

Not connected

1x100MVA Darbhanga

Pandaul

Sitamari

Muzf Town

Radialised Load

( 50-55 MW)

Madhubani

MB TB

220 kV lineCharged at 132kv

17

Restoration of Outaged Elements

Eastern Region

18

BiharSharif

Tenu GhatPatratu

Bodh Gaya

Dehri

Pusauli

X

To Sahupuri

Arrah

Khagol

Fatuha

To NR

3 x 315

MVA

2 x 315 MVA

To Begusarai

To Khalgaon

To Muzaffarpur

Eastern Region NetworkTala

System

ER map

Bihar

Jharkhand

19

Grid Discipline

20

Synchronous Interconnection of Northern Grid with Central Grid

• “Large grid” comprising of NER, ER, WR & NR• Over 250 power stations • Total installed generation capacity of 88,000 MW • Operating size of 60,000 MW• Cover 80% of the country’s area • Cater to 78 % of country’s population• Comparable to the system affected during the US

Blackout of 14th August 2003 (10 % of Eastern Interconnection)

21

Paradigm shift in system operation

• Greater emphasis on –Network reliability

–Protection systems

–Grid discipline

–Handling emergencies

22

Grid Discipline• Tie-line control and network loading important• Frequency might be a misleading• Overdrawals/ under drawals to be kept within safe

limits • OD/UD reflected on the ER-NR & ER-WR tie-

line flows.• Ramping up and ramping down of generation,

switching in and out of loads have to be done gradually

• RLDC instructions to be followed

States

Generators

23

Protection System

24

S No. Date Time Description of loss/ tripping

1 14th April 05 1135 2100 MW at Kota + Suratgarh

2 21st April 05 2047 1400 MW Anpara

3 28th Apr 05 1530 Talcher-Kolar

4 17th May 05 1253 1335 MW at Jhakri + 300 MW Baspa + 1200 MW Suratgarh = Total 2835 MW

5 19th Jun 05 1359 350 MW at NAPS

6 06th July 05 0123 1350 MW at Dadri complex + HVDC Bipole

7 25th August 05 1321 1100 MW Anpara + 500 MW Obra

8 31st Aug 05 1530 Talcher-Kolar

9 11th Sep 05 1247 800 MW at Dadri (Th)

10 17th Nov 05 0413 488 MW Auraiya

11 26th Nov 05 0340 400 MW at Bhatinda

12 2nd Jan 06 0225 600 MW Ropar

13 10th Jan 06 2327 Western Grid Separation

Major Trippings incidents

Three large incidents have occurred in 2006-07 in Northern Region

25

• Suggested UFR settings– NR & WR

• 1st stage : 48.8 Hz, instantaneous

• 2nd stage: 48.6 Hz, instantaneous

• 3rd stage: 48.2 Hz, instantaneous

– ER (No change)• 1st stage: 48.5 Hz, instantaneous

• 2nd stage 48.2 Hz, instantaneous

• Settings of df/dt relays in WR & NR to be reviewed

Defence Plans

26

Optimal/Continuous use of Inter-regional radial links

27

Bhutan

North EasternRegion

Eastern

Region

Northern Region

Western Region

Southern Region

Pusauli B/B HVDC

Vin

dh

yach

al B

/B H

VD

C

Bh

adra

vati

B/B

HV

DC

Gazuwaka B/B HVDC

Talchar-Kolar bi-pole HVDC

220 kV Sahupuri-Pusauli

Up

per

Sil

eru

-Bal

imel

a

220

kV C

hikh

odi-

Kol

hapu

r

220

kV

Ujj

ain-

Kot

a/M

orak

220

kV M

alan

pur-

Aur

aiya

400 kV Raipur-Rourkela

220 kV Korba-Budhipadar

400 kV Gorakhpur-Muzaffarpur

28

Handling Contingencies

29

Impact of loss of 1800 MW generation in NR

25000 MWNR Grid

10000 MWER-NER Grid

No primary responseFrequency drop of 1 HzReduction in NR load by 750 MWFlow on ER-NR interconnector = 1800 MW-750 MW = 1050 MW

Equivalent to reduction in ER+WR+NER Grid load by 1050 MWContribution from WR = 750 MW

25000 MWWestern Grid

1050 MW

750 MW

30

Impact of loss of 1800 MW generation in WR

25000 MWNR Grid

10000 MWER-NER Grid

No primary responseFrequency drop of 1 HzReduction in WR load by 750 MWFlow on ER-WR interconnector = 1800 -750 = 1050 MW

Equivalent to reduction in NR + ER Grid load by 1050 MWContribution from NR = 750 MW

25000 MWWestern Grid

1050

MW

750 MW

31

Thank You !